Eff ect of Revalor- XH, Revalor- 200, and Combination Revalor- IH/Revalor- 200 on Yearling Heifer Growth Performance and Carcass Characteristics

Authors

• Zachary E. Carlson, University of Nebraska - Lincoln
• Galen E. Erickson, University of Nebraska - LincolnFollow
• Caitlin A. Coulson, Cattlemen’s Nutrition Services
• D. J. Jordon, Cattlemen’s Nutrition Services
• Robert J. Cooper, Cattlemen’s Nutrition Services
• Tony L. Scott, Cattlemen’s Nutrition Services
• Sheri J. Bundy, Cattlemen’s Nutrition Services
• Brandon L. Nuttelman, Merck Animal Health

Date of this Version

2020

Citation

The Board Regents of the University of Nebraska. All rights reserved.

Comments

2020 Nebraska Beef Cattle Report

Abstract

A commercial feedlot trial tested three implant strategies (Revalor- 200 on day 0, Revalor- IH on d 0 and re- implanted with Revalor- 200 on d 56, or Revalor- XH on d 0) on growth performance and carcass characteristics of heifers fed for 138 d. Th ere were no differences observed for final body weight, dry matter intake, or average daily gain on a live basis among implant strategies. Heifers implanted with Revalor- IH/200 combination had greater carcass- adjusted final body weight and improved feed conversion compared to Revalor- 200 and Revalor- XH. Hot carcass weights, dressing percent, and LM area were improved for Revalor- IH/200 implanted heifers relative to Revalor- 200 and Revalor- XH implanted heifers. Marbling score and 12th- rib fat thickness were not different among implant treatments. Heifers implanted with Revalor- IH/200 had a shift to a lower USDA yield grade distribution compared to 200 and XH implanted heifers. Th e greater concentration of trenbolone acetate and estradiol provided by Revalor- IH/200 combination slightly improved growth and carcass performance compared to the non- coated Revalor- 200 implant and partially coated Revalor- XH implant.